Casio SF-3000 Digital Diary Repair

The SF-3000 is a pocket-sized electronic diary and organizer that was released around 1986, and is part of a popular line of similar products by Casio.

Essentially a predecessor to the PDA, This device would be used to log and organize information, usually business-oriented, to make plans, keep track of events, and perform basic math calculations. Users would also be able to store more sensitive data, like contacts and important memos, into a designated 'secret' area with a built-in password registration system.

The device consist of 2 metal casings fastened to 2 red plastic frames that hold the electronics. Both casings and frames are separated 1-to-1 by a hinge that folds and snaps shut, and when opened, reveals the actual device. In between the hinges and the small gap between the frames that the hinges make, a black film that connects each half of the device together helps keeps the device operational on both sides.

The bottom frame holds the math operation buttons, which sit above the custom-layout QWERTY keypad, as well as buttons for setting the date and time, and data entry. The main power switch is also visible off to the left. The top frame holds the numeric keypad to the right, with other buttons for navigation and power, and the left holds the LCD display and an array of 7 buttons that access the modes for the functions mentioned before.

On the outside, the 2 metal casings can be in either 2 colors, with a suffix added to the model number for the color of the case. BK = black case (as shown above), GD = gold case. The top casing is lightly embossed with diagonal lines for grip, and has the branding and product name printed on the top-left and top-right, respectively. The bottom casing is flat, and is fastened to their respective plastic frame by 2 screws. Around the bottom left corner, if facing the casing directly, the power and manufacturer information is printed, as well as the reset button, accessible with a small pointed object.

Model no.: SF-3000 (BK/GD)

Operating Temp.: 0°C ~ 40°C (32°F ~ 104°F)

Dimensions:

Folded (HxWxD): 17.2mm x 126mm x 67mm (5/8" x 5" x 2 5/8")

Unfolded (HxWxD): 8.6mm x 126mm x 134mm (3/8" x 5" x 5 1/4")

Weight: 150g (5.3 oz) with batteries

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Memory capacity: 1.497kb (standard), 9.689kb*, 17.881kb*

• *Uses RAM expansion packs RP-8 and RP-16, respectively

Power Specs:

Main power: 3x CR2032C

• Lasts up to 120 hours w/ continuous use

Memory back-up: CR1220

• Lasts every 2 years

Consumption: 0.02W

Automatically turns off after 6 minutes from last key-press

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Display:

Type: Monochrome LCD

Matrix size: 95 x 32-dot (16-column x 4-row)

Dimensions (WxH, Di.): 5.5cm x 3cm, 6.2cm Diagonal

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Calculation Specs:

Operations: +, -, x, ÷, =, %, √, M+, M-, MR, MC

Digit computation:

• 20-digit approximations, 10-digit capacity

Decimal System: Full-float plus underflow

Error Failsafe: Suspension of calculation operation, 'E' shown on display

Logic: C-MOS LSI

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Spanish blog post about this device

Image gallery w/ box art, specs, and French advert

Specs and Brochure

Image gallery and specs

Reddit post troubleshooting a data search error